Its mentioned that Frenzy was something Matra was supposed to replace, but also that its a 'twisted side of matra'.
As a thought, I like the concept of Frenzy -and so I say that either
A) Fenris should replace all references to it; evil druids still need something to worship.
OR
B) Frenzy concept should be retained, but added into the Matra article, and rather than something Matra was meant to replace, it should in fact be apart of matra, a sort of mental schism -two gods that are in fact the same god, two aspects of nature in a sort of dualism. As a god it has the same domains, its just a more desrtuctive rather than creative avatar for Matra worshiped more by evil and good -WITHOUT actually being evil itself technically.

"Ya can hoot, ya can holla-make any noise ya like! But if ya cant chant, oh if ya cant chant, well…ya no cult o' mine!" http://www.youtube.com/watch?v=7movKfyTBII
~Ishkokum Mes Mosof She'res~
"Congratulations, you can link to TV Tropes. This does not mean you have special insight into the storytelling process, much less the author's mind. Stories don't need to fit into neat boxes, you know.

At first I hacked Frenzy because she had the same, or very nearly so, domains as both Matra and Tharizdun. But then I realized, after some consideration, that Frenzy fit perfectly into the Therafim setting. Tharizdun, on the other hand, did not. Before thinking about it, I had thought to keep Tharizdun, since he was essentially a D&D version of Cthulhu that avoided the copyright which was still extant when he was first introduced. Then I took a look around, and saw that the Nightmare King filled that role just fine for Therafim, while Frenzy filled a perfect little niche in opposition to Matra, just like the Nightmare King opposed Umnos. So, out went the elderdark horror. But not completely.

You see, I still had this odd god out, which was Apophis in the original lineup of deities, called Worm in his reimagined form. He was supposed to be the serpentfolk god, and sort of like Set was in the original Conan movie, an orgiastic and highly charismatic god of creatures untouched by light. Tharizdun fit that bill, surprisingly enough, but was far too "extroverted" about it, lacking subtlety in his methods of smash-and-grab divine power. Worm was a more subtle deity, a borderline entity that could almost be accepted into the family of the gods, if only he wasn't trying to corrupt all of reality like a worm gnawing at the base of a tree. I wanted to keep the Elder Elemental Eye, because of the monsters and adventures that were tied to him, which I felt could be run in Therafim, which I've always wanted to be a "limited" kitchen sink sort of campaign setting (no high-tech stuff, in other words, but most other things are allowed). So, how better to keep the Elder Elemental Eye in play than to have his power tossed off into the hinterworlds, and his essence remain a part of Worm, who was forced to be subtle since he'd lost the power to challenge gods directly? That's what I did, and all of the Forbidden Gods then fit neatly into their assigned places, having to rely on slow and craft means for the most part rather than direct conflict.

A sound plan, albeit I might have done it a bit differently -but as always YMMV and there's no right way to enchant a vorpal Reeses.

"Ya can hoot, ya can holla-make any noise ya like! But if ya cant chant, oh if ya cant chant, well…ya no cult o' mine!" http://www.youtube.com/watch?v=7movKfyTBII
~Ishkokum Mes Mosof She'res~
"Congratulations, you can link to TV Tropes. This does not mean you have special insight into the storytelling process, much less the author's mind. Stories don't need to fit into neat boxes, you know.